ARM: 7363/1: DEBUG_LL: limit early mapping to the minimum (f67860a7) · Commits · 戴 / test

There is just no point mapping up to 512MB for a serial port. Using a single 1MB entry is way sufficient for all users. This will create less interference for the following debugging patch. Signed-off-by:

Nicolas Pitre <nico@linaro.org> Signed-off-by:

Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/kernel/head.S

+1 −8

Original line number	Diff line number	Diff line
		@@ -277,10 +277,6 @@ __create_page_tables:
		mov r3, r3, lsl #PMD_ORDER

		add r0, r4, r3
		rsb r3, r3, #0x4000 @ PTRS_PER_PGD*sizeof(long)
		cmp r3, #0x0800 @ limit to 512MB
		movhi r3, #0x0800
		add r6, r0, r3
		mov r3, r7, lsr #SECTION_SHIFT
		ldr r7, [r10, #PROCINFO_IO_MMUFLAGS] @ io_mmuflags
		orr r3, r7, r3, lsl #SECTION_SHIFT
		@@ -289,13 +285,10 @@ __create_page_tables:
		#else
		orr r3, r3, #PMD_SECT_XN
		#endif
		1: str r3, [r0], #4
		str r3, [r0], #4
		#ifdef CONFIG_ARM_LPAE
		str r7, [r0], #4
		#endif
		add r3, r3, #1 << SECTION_SHIFT
		cmp r0, r6
		blo 1b

		#else /* CONFIG_DEBUG_ICEDCC \|\| CONFIG_DEBUG_SEMIHOSTING */
		/* we don't need any serial debugging mappings */

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